// The libMesh Finite Element Library.
// Copyright (C) 2002-2021 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef DIRECTSOLUTIONTRANSFER_H
#define DIRECTSOLUTIONTRANSFER_H

#include "libmesh/solution_transfer.h"

#include <string>

namespace libMesh
{

/**
 * Implementation of a SolutionTransfer object that only works for
 * transferring the solution but only in the case of:
 *
 * 1. The Systems must have EXACTLY the same mesh.
 * 2. The two variables involved must have EXACTLY the same finite
 *    element family and order.
 *
 * \author Derek Gaston
 * \date 2013
 * \brief Implements solution transfers for matched variable/mesh case.
 */
class DirectSolutionTransfer : public SolutionTransfer
{
public:
  DirectSolutionTransfer(const Parallel::Communicator & comm_in);
  virtual ~DirectSolutionTransfer();

  /**
   * Transfer the values of a variable to another.
   */
  virtual void transfer(const Variable & from_var, const Variable & to_var) override;
};

} // namespace libMesh

#endif // #define DIRECTSOLUTIONTRANSFER_H
